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Finding the Fourth Proportional to 128,882.84, 193,400.80 and 69,717.20

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Solution

The fourth proportional to 128,882.84, 193,400.80 and 69,717.20 is: 104,617.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,882.84 : 193,400.80 = 69,717.20 : x
  2. Step 2: Convert to fraction form
    128,882.84/193,400.80 = 69,717.20/x
  3. Step 3: Cross multiply
    128,882.84x = 193,400.80 × 69,717.20
  4. Step 4: Simplify right side
    128,882.84x = 13,483,362,253.76
  5. Step 5: Solve for x
    x = 13,483,362,253.76/128,882.84
  6. Step 6: Final answer
    x = 104,617.20

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.